package com.wrc.springmvc.mqtt;

import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

/**
 * Description
 *   客户端程序
 * Company Beijing 
 * author  youxuan  E-mail:xuanyouwu@163.com
 * date createTime：16/7/13
 * version
 */
public class Client {

	public static final String	HOST	 = "tcp://192.168.1.25:1883";

	public static final String	TOPIC	 = "toclient/124";

	private static final String	clientid = "client124";

	private MqttClient			client;

	private MqttConnectOptions	options;

	private String				userName = "mqtt";

	private String				passWord = "123456";

	//	private ScheduledExecutorService scheduler;

	private void start() {
		try {
			// host为主机名，clientid即连接MQTT的客户端ID，一般以唯一标识符表示，MemoryPersistence设置clientid的保存形式，默认为以内存保存  
			client = new MqttClient(HOST, clientid, new MemoryPersistence());
			// MQTT的连接设置  
			options = new MqttConnectOptions();
			// 设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，这里设置为true表示每次连接到服务器都以新的身份连接  
			options.setCleanSession(true);
			// 设置连接的用户名  
			options.setUserName(userName);
			// 设置连接的密码  
			options.setPassword(passWord.toCharArray());
			// 设置超时时间 单位为秒  
			options.setConnectionTimeout(10);
			// 设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制  
			options.setKeepAliveInterval(20);
			// 设置回调  
			client.setCallback(new PushCallback());
			MqttTopic topic = client.getTopic(TOPIC);
			//setWill方法，如果项目中需要知道客户端是否掉线可以调用该方法。设置最终端口的通知消息    
			options.setWill(topic, "close".getBytes(), 2, true);

			client.connect(options);
			//订阅消息  
			int[] Qos = { 1 };
			String[] topic1 = { TOPIC };
			client.subscribe(topic1, Qos);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) throws MqttException {
		Client client = new Client();
		client.start();
	}
}